My plan for the future is to live by myself with a dog and live happily ever after, but my friends and family would definitely question me or my morals if I never neutered my dog. How do you get around this?
The main question I would ask is: what is your goal, and why do you care?
If you want to save your breath, tell people it’s your dog and you’re in charge. Anything that remotely sounds like trying to justify yourself is just an opening for people to try and thrust their preferences and beliefs upon you. Many will not hesitate to add a flavor of guilt / shame to try and make you comply, even if they cannot explain why you should.
If you’re willing to invest time in it, have constructive conversations, and convince them... ask them why they think it’s something that should be done. If they do not demonstrate knowledge and instead suggest it’s a strong belief of this “being the right thing”, dig into it till you reach more substance. When they provide arguments, find the truth and if they are incorrect (or the reality is unknown) gently explain how and provide sources.
Being an owner means you’re watching after your animals and ensuring their safety as well as basic training.
Neutering isn’t the default in many european countries, and the vast majority of dog owners there aren’t swimming in unwanted puppies.
There are people who regret neutering their pet because their behavior changed forever, and they weren’t “themselves” in a way.
Some people believe it makes dogs agressive because of signs in park suggesting “no unneutered dogs”, it’s actually the opposite: neutered dogs can be fearful of unneutered ones, and fear is a cause of agressivity (you can find scientific literature for the full story).
There are endless themes to be explored, my point here is that you can show that it is a decision that should be informed -- and that you are informed.
Some people cannot be convinced by even trivially demonstrable truths, some people are willing to discuss and accept nuance, and some people can be swung the other way by yelling your convictions louder than they do. Use your best social judgement, and remember that most people are reasonable (most people aren’t on twitter, most people aren’t loudly angry at the world or at differences, etc. the majority is silent).
Some are also afraid of discovering going with the flow (either socially, or because the vet suggested it, or whatever else) on an irreversible decision wasn’t a good idea. It’s very unpleasant to discover, understand, and accept that type of things.